I really don't understand some of the poll options. It's also kind of ridiculous to exclude anime from the conversation. Anyway, I digress.
Contributing to the thread, here's a list of 20 of my favorite Sci-Fi themed cartoons, in no particular order:
Silverhawks
Jayce and the Wheeled Warriors
Transformers G1/G2/Beast Wars/Beast Machines
Red Planet
Highlander: The Animated Series
Robotech
Voltron
Batman Beyond
Men in Black: The Animated Series
Star Wars: The Clone Wars
Biker Mice from Mars
Mighty Max
Cyberquest
M.A.S.K.
Digimon
Bravestarr
He-Man/The New Adventures of He-Man
Teenage Mutant Ninja Turtles (1987-1994 iteration)
Jem and the Holograms
She-Ra